Gluba Łukasz, Rafalska-Przysucha Anna, Szewczak Kamil, Łukowski Mateusz, Szlązak Radosław, Vitková Justína, Kobyłecki Rafał, Bis Zbigniew, Wichliński Michał, Zarzycki Robert, Kacprzak Andrzej, Usowicz Bogusław
Institute of Agrophysics, Polish Academy of Sciences 4, 20-290 Lublin, Poland.
Institute of Hydrology of the Slovak Academy of Sciences, 841 04 Bratislava, Slovakia.
Materials (Basel). 2021 Mar 10;14(6):1335. doi: 10.3390/ma14061335.
Biochar application has been reported to improve the physical, chemical, and hydrological properties of soil. However, the information about the size fraction composition of the applied biochar as a factor that may have an impact on the properties of soil-biochar mixtures is often underappreciated. Our research shows how sunflower husk biochar (pyrolyzed at 650 °C) can modify the water retention characteristics of arable sandy soil depending on the biochar dose (up to 9.52 wt.%) and particle size (<50 µm, 50-100 µm, 100-250 µm). For comparison, we used soil samples mixed with biochar passed through 2 mm sieve and an unamended reference. The addition of sieved biochar to the soil caused a 30% increase in the available water content (AWC) in comparing to the soil without biochar. However, the most notable improvement (doubling the reference AWC value from 0.078 m m to 0.157 m m) was observed at the lowest doses of biochar (0.95 and 2.24 wt.%) and for the finest size fractions (below 100 µm). The water retention effects on sandy soil are explained as the interplay between the dose, the size of biochar particles, and the porous properties of biochar fractions.
据报道，生物炭的施用可改善土壤的物理、化学和水文性质。然而，作为可能影响土壤-生物炭混合物性质的一个因素，有关施用生物炭的粒径组成的信息常常未得到充分重视。我们的研究表明，向日葵壳生物炭（在650℃下热解）如何根据生物炭剂量（高达9.52重量%）和粒径（<50µm、50-100µm、100-250µm）改变耕地沙质土壤的保水特性。为作比较，我们使用了与通过2毫米筛网的生物炭混合的土壤样品以及未改良的对照样品。与未添加生物炭的土壤相比，向土壤中添加过筛生物炭使有效含水量（AWC）增加了30%。然而，在最低生物炭剂量（0.95和2.24重量%）以及最细粒径部分（低于100µm）下观察到了最显著的改善（对照AWC值从0.078毫米翻倍至0.157毫米）。生物炭对沙质土壤的保水作用被解释为生物炭剂量、颗粒大小与生物炭组分孔隙特性之间的相互作用。
